Envelop.



W. F. CROWELL.

ENVELOP.

APPLICATION FILED MAR. 28, 1912.

Patented Feb. 4, 1913.

3 SHEETSSHEET 1.

I WITNESSES l? INVENTOR Z WZZz'amZ a'owell ATTORNEYS W. F. GROWELL.

ENVBLOP.

APPLICATION FILED MAR. 28, 1912.

1,052,322. Patented Feb. 4, 1913.

3 SHEETS-SHEET 2.

WITH/E8858 INVENTOR ATTORNEYS ENVELOP.

7 Specification of Letters Patent.

Patented Feb. 4, 1913.

" Application filed March 28, 1912. Serial No. 686,823.

To all whomvit may concern:

ing paper material in the manufacture ofthe envelop, dispensing with theuse of special dies to form the blanks, and allowing the formation ofenvelops of different 7 sizes from a sheet of the same width.

For the purpose mentioned use is made of a blank formed of a strip ofpaper or other envelop material of a uniform width and provided withmeans to form foldable sections adapted to be fastened together so as toproduce a sectional front and a sectional back.

A practical embodiment of the invention is. represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference indicate corresponding .partsin all theviews.

Figure 1 is a plan view of a blank for forming .the envelop; Figs. 2 and3 are like views of the same showing the successive steps in folding thesections; Fig. 4 is a front face view of the envelop with the sealingflap in open position; Fig. 5 is a rear view of the same; Fig. 6 is alike view of the envelop after being sealed; Fig. 7 is an enlarged crosssection of the same on the line77 of Fig. 5; Fig. 8 is a plan view of amodified form of a blank for forming an envelop Without the sealingflap; Fig. 9 is a like view of the same partly folded; Fig.-

10 is a face view of the envelop formed from the blank shown .in Figs. 8and 9; Fig. 11

is an enlarged cross section of the same on the line 11-11 of Fig. 10;Fig. 12 is a perspective view of one of the lower corners o the envelopprior to folding the parts into final position; Fig. 13 is a crosssection of the same on the line 1313 of Fig. 10; Figs. 14, 15 and 16-are plan views of blank strips from which the blanks are cut for makingenvelops of different forms; and Figs-17, 18

and 19 are rear face views of the envelops produced from the blanksshown in the corresponding Figs. 14, 15 and 16.

The envelop is formed from a blank A of uniform width and folded alongthe lines or creases or scores B- arranged to form triangular sectionsC, D, E, F and G, of which the section C forms the sealing flap and thesections D and F form the front of the .en- 'velop while the sections Eand G form the back of the envelop on folding. the parts as indicated inFigs. 2 and 3. In order to permit convenient folding along the lines Bindicated and to provide overlapping edges the top and bottom edges ofthe blank A are pgovided with notches H, H, and a similar 11 tch H isarranged in the bottom edge of the blank A at the points indicated inFig. 1 and the lower corners are cut ofi as shown at H and H. Thesealing flap C is provided with gummed'margins I and the section F isprovided with; a gummed margin I, and a similar gummed margin I isformed on the section G, so that when the parts are folded the section Foverlies the section D and is fastened thereto by thebe sealed by thesealing flap C in the usual manner.

The blanks A are cut from a continuous strip of paper and the creasesmay be differently arranged, as will be readily understood by referenceto Figs. 14, 15 and 16, to form envelops of different shapes and sizes(see Figs. 17, 18 and 19 without varying the width of the strip mm whichthe blanks are cut. It is understood that in either case the envelopsare formed in the mannzer above described in reference to Figs. 1 to Inthe modified form shown in Figs. 8 to 13, use is made of a blank A ofuniform width throughout its length, and the blank is provided withcreases B to divide the blank into sections J, K, L and N, which whenfolded form an envelop having a se'c-- tional front and a sectionalback, the secf tional front-consisting of the sections N and K, and thesectional back consisting of the sections L and J. The section N is.provided with a gummed margin 0 for fastening the overlapping edges ofthe sections K and N together, and, the section J is provided with agummed margin G for fastening the overlapping edges J and L together, asplainly mdicated in the drawings. In this case, the sealing flappreviously escribed in reference to Figs. 1 to 7 is dispensed with andthe envelop is openat the to instead of providing the blank A withnotches, the innercorners of the envelop may have the portions K and Lof the sections K and L doubled up, as plainly indicated in Figs. 10, 12and 13, so as to provide strong reinforced corners.

, From the foregoing it will be seen that in either form of'the envelopthe front and the back of the-envelop are made in sections fastenedtogether, and the envelop is pro duced from blanks cut from strips ofpaper I of uniform width without wastlng any of the paper material- Itits understood that in practice 7 the blank is folded in the mannerdescribed by a suitably constructed folded machine.

Having thus described my invention, I claim as new and desire to secureby LettersPatent:

1. An envelop, comprising a front made i of sections fastened togetheralong overlapping diagonal edges, and a back made of sections fastenedtogether along overlapping diagonal edges.

2. An envelo com rising a front made of two sections astene togetheralong overlapping diagonal edges, a back. made of two sections fastenedtogether along overlapping diagonal edges,,-and a sealing flap integralwith one of the front sections.

3. An envelop formed from a rectangular sheet of paper and comprising afront having two triangular sections fastened together along overlappingdiagonal edges, and aback having two triangular sections integral withthe said front sections and fastened together alongoverlapping diagonaledges.

4;. An envelop formed from a rectangular sheet of paper and comprising afront having two triangular sections fastened together along overlappingdiagonal edges; a back having two triangular sections integral with thesaid front sections and fastened together along overlapping diagonaledges,

1 and a sealing flap'integral with one of the

